Other than the applicant's default notification mail template, you can create multiple mail templates for the applicant from the 'Templates' settings. Subject and the mail content added in these templates will be automatically pre-filled when you choose the required 'Email template' from the 'Emails' section in the application edit screen.
Give a Template Name, Subject and Content of your choice.
You can generate content by copy pasting from Template Tags.
You can add as many templates as you like by adding New Templates.